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(: Test: K-SeqExprCastable-23                            :)
(: Written by: Frans Englich                             :)
(: Date: 2007-11-22T11:31:22+01:00                       :)
(: Purpose: A test whose essence is: `not(("one", "two") castable as xs:string?)`. :)
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not(("one", "two") castable as xs:string?)